package com.millstein.springcloud.service;

import cn.hutool.core.util.IdUtil;
import com.netflix.hystrix.contrib.javanica.annotation.DefaultProperties;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

@Service
public class PaymentService {

    public String paymentInfo_OK(Integer id) {
        return "线程池：" + Thread.currentThread().getName() + ", paymentInfo_OK, id:" + id + "（成功）";
    }

    @HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler", commandProperties = {
            // 3s内是正常逻辑，超过3s就调用fallback方法
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "3000")
    })
    public String paymentInfo_TimeOut(Integer id) {
        int time = 5;
        try {
            TimeUnit.SECONDS.sleep(time);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "线程池：" + Thread.currentThread().getName() + ", paymentInfo_TimeOut, id:" + id + "（耗时" + time + "秒钟）";
    }

    public String paymentInfo_TimeOutHandler(Integer id) {
        return "线程池：" + Thread.currentThread().getName() + ", 8001系统繁忙或运行出错, id:" + id + "（失败）";
    }

    // ==========服务熔断==============
    @HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback", commandProperties = {
            // 总的含义是指，在10s的范围内，10次请求中有60%的请求失败就会启动断路器
            @HystrixProperty(name = "circuitBreaker.enabled", value = "true"), // 是否开启断路器
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold", value = "10"), // 请求次数
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds", value = "10000"), // 时间范围
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage", value = "60") // 失败率达到多少后跳闸
    })
    public String paymentCircuitBreaker(Integer id) {
        if (id < 0) {
            throw new RuntimeException("*****id不合法");
        }
        String serialNum = IdUtil.simpleUUID();
        return Thread.currentThread().getName() + "\t调用成功，流水号为：" + serialNum;
    }

    public String paymentCircuitBreaker_fallback(Integer id) {
        return "id不合法，请稍后重试。id：" + id;
    }
}
